Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c684b4720a9996…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 09:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e52c721bdabef82acfdd793ee7e8b98d SHA-1: 3b8e45b2ce0caf193cc20fce938694898474dc8e SHA-256: e7c684b4720a9996b4d6b1c2a87cc70f753c69fbbd7f4db9b75aefcbbea1f724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lnyuanzong.com/uploads/files/20210913121149.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86747895150.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/rokogarof.pdfIn PDF document text
    • http://umhouses.com/uploads/files/nuvex.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vozek.pdfIn PDF document text
    • https://partnermind.cz/images/files/tuvudugevarekazanire.pdfIn PDF document text
    • https://songhongresort.com/img/files/pinoforez.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/pajumiti.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/75536693435.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d700948f9095c8d1eedd82e12fb0f648/bafat.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/tofojafefanugure.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/nebosetegofitipepugolegu.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/mumedugut.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/8035346655.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/92366838376.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wusujizemepugazakitu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jidetubisuduvos.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210912020402.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/87352709712.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0909/d900e0a09bfe901411cec194f898318b.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131276e3138c---busaguponepusasimuwig.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9b3a2e7acdf1bc78a699f59821a603a9/kunovudivebizofazaj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819e2830cc---bolisorobilexokinaresot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ppsspp+car+game+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AC 10756 bytes
SHA-256: 7b3619623135d49cff285d09cb5894c4e0e2f2da9532ca5b9102605ca8456e86
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 17144 bytes
SHA-256: 6c598b22b42e97ca38e5bb660f2c7d620c039beb9426beb5e00f4222bfd0b5ad
font_02_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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